Friction-clutch.



No. 644,06l. Patented Feb. 27, I900.

G. W. COFFIELD.

FRICTION CLUTCH.

Y (Application filed om. 1A,, 159 C (No Model.) 2 Sheets-Sheet 2Wdnesses: lmJenXor.

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THE NORRIS PETERS co, morauma, 'mswmmou, n. c.

UNITED STATES PATENT OFFICE.

GEORGE W. COFFIELD, OF DAYTON, OHIO.

FRICTION-CLUTCH.

SPECIFICATION forming part of Letters Eatent No. 644,061, dated February27, 1900.

Application filed October 14, 1899. Serial No. 738,556. (No model.)

To all whom, it may concern:

Be it known that I, GEORGE W. COFFIELD, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented certain new and useful Improvements in Friction-Clutches; and Ido declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to a reversible shaftclutch and possesses thenovel and useful features hereinafter described and claimed.

Referring to the accompanying drawings, Figure 1 is an elevation of myimproved clutch. Fig.2 is alongitudinal sectional view of the same. Fig.3is a side elevation of the wheel upon which are supported thebevelpinions.

In the detailed description similar letters of reference indicatecorresponding parts.

A is a shaft which has a loose pulley B, with side flange C. This pulleyis the main element through which power is transmitted to said shaft, aswill hereinafter be fully described. To one side of and adjacent to saidpulley B is a wheel D, which is fast on the shaft, and adjacent to wheelD is a wheel E, which is loose on said shaft.

F is a metallic band or strap, which spirally encircles the wheel D, oneend thereof being connected at G to main pulley B and the other endconnected to wheel E at H.

I is an ordinary shifting clutch of wellknown construction. This clutchis mounted on the shaft to turn therewith and is movable along the shaftto engage and release hub E of wheel E. The engagement is effected bymoving the shifting block or wheel K in the direction of the hub E.During such movement the tapering surface of said wheel K acting uponthe outer ends of the levers I causes said levers to frictionally engagethe hub E.

The main pulley B has either fast on its hub or an integral part thereofa bevel gear-wheel L, which meshes with three bevel-pinions M, which, itwill therefore be'seen, are driven constantly by pulley B. The pinions Mare mounted equal distances apart on shafts O, which are journaled inpulley N. The latter pulley is adjacent to said pulley B and is loose'onthe shaft. A-bevel gear-wheel P meshes with said pinions M on the sideopposite wheel L. This wheel P is fast on the shaft. A metallic band orstrap Q is wrapped spirally around wheel N, one end thereof beingsecured to an immovable part B adjacent to the wheel and the other endsecured to a .hand-operated tightening-bar S, which when drawn upon ismade to frictionally bind the band Q to the wheel N to hold said wheelstationary.

When wheel E is held by clutch-levers I, band F is caused tofrictionally bind pulley D. The shaft and entire system of wheelsthereon rotate in the same direction with pulley B, band Q being loose.When the clutchlevers I are disengaged, and band Q is tightened bydrawing on bar S, the shaft and entire system, with the exception ofmain pulley B and wheel E, are made to turn in an opposite directionfrom that first described. These reversed movements may be imparted tothe shaft without stopping the power, as will be understood from theforegoing description and the drawings of my invention.

Having described my invention, I claim- In a reversible friction-clutch,the combination with a single shaft, of a main pulley B loose thereon,an adjacent wheel D tight on said shaft, an end wheel E loose on saidshaft, a band F inclosing wheel D and one end of which is secured to themain pulley B and the other end of which is secured to wheel E, clutchdevices secured to the shaft and adapted to lock wheel E to the shaft, awheel N loose on the shaft, bevel-pinions M carried on the interior ofsaid wheel N, a bevel gear wheel L loose on the shaft, another bevelgear-wheel P tight on said shaft, the said wheels L and P engaging withopposite sides of the pinions M, and a band Q inclosing wheel N one endof said band being secured to a fixed point and the other end beingsecured to an operating-bar, whereby means are provided for driving theshaft in a direction with the main pulley and for reversing the movementof said shaft, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE W. COFFIELD. Witnesses:

JOHN W. KALBFUS,

R. J. MOCARTY.

